Unless the Subaru fuse block is different than every other OEM one I have seen, a new one will be pretty much a hunk of plastic with places for the the ends of wires with female spade/blade lugs to go.
A new one is not going to fix any wiring problem as it won't come with wires, you will have to move all your wiring over into it.
Unbolt the existing one and find the problem or pay somebody to do it.
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I am a Commodore PET --- Now get off my lawn you kids...
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